You are right... the improvement of graphics is jaw dropping when I installed 337.88!

NVidia totally killed OpenGL it seems.

With 337.88, after a while (15-30 minutes? It's hard to keep time with this software...) when I returned to earth, earth had lost all its cloud cover. I enabled/disabled cloud, checked other things - nothing seemed to work.

I exited and restarted - that worked. Is this also driver related issue?